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LS1021A-IoT UART Problem

Question asked by Tae-hyung Kim on Nov 6, 2016
Latest reply on Nov 7, 2016 by Pavel Chubakov

I have a two board. One is ls1021a-twr and other is ls1021a-iot.

When I modify UART part (uart 2, 3, 4) disabled -> okey in device tree file with ls1021a-twr, I can use uart 2, 3, 4.


But I can not use uart 2, 3, 4 in ls1021a-iot board.

I can see ttyS2, ttyS3, ttyS4. I can not send signal with minicom.


UART 2, 3, 4 is duplicated with LPUART1 (RXD, TXD, RTS, CTS) and LCD H-Sync, V-Sync signal.


In ls1021a-iot document page 12 : For full VSYNC/HSYNC support, the RCW needs to be updated to enable these signals and UART1 cannot be used. See the device errata for details.


For using UART, RCW must be modifyed?